Sharp LC-26A37M Service Manual page 19

9. White Balance Adjustment
Adjustment gradation values (IN) appear on page 7/11 of process adjustment, and adjustment initial values (offset value) appear on pages 8/11 and
9/11. For white balance adjustment, adjust the offset values on pages 8/11 and 9/11.
[Condition of the unit for inspection] Modulated light: MAX (+8)
[Adjustment reference device] Minolta CA-210
[Adjustment]
Check that the values on page 7/11 of process adjustment are set as below. If not, change them accordingly.
M GAMMA IN 2 320
1) Display the current adjustment status at point 6. (Page 7/11 of process adjustment)
The display for checking the adjustment status is toggled by pressing the "6" button on the remote control.
(Normal OSD display → "6" → display for check (OSD disappears) → "6" →normal OSD display → • • •)
2) Read the value of the luminance meter.
3) Change M GAMMA R6/M GAMMA B6 (Adjustment offset value) on page 9/11 of process adjustment so that the values of the luminance meter
approach x = 0.272 and y = 0.277.
(Basically, G is not changed. If adjustment fails with R and B, change G. When G is lowered, the weaker of R and B must be fixed.)
4) If G is changed in step 3), change the values of M GAMMA G2 on pages 8/11 and 9/11 of process adjustment as follows. When not changed, go
to step5).
Offset value of M GAMMA G2 = (Offset value of M GAMMA G6) * (320/928)
5) Display the adjustment status of the current point 2. (Each time the "2" button on the remote control is pressed, the adjustment status check dis-
play is toggled.)
(Normal OSD display → "2" → Check display (OSD disappears) → "2" → Normal OSD display → • • •)
Change M GAMMA R5/M GAMMA B2 (adjustment offset value) on page 9/11 of process adjustment so that the values of the luminance meter
approach x = 0.272 and y = 0.277.
[Adjustment reference standard value]
±0.004
Adjustment spec
±0.002
Adjustment spec
M GAMMA IN 6 928
±0.006 (point 1)
Inspection spec
±0.004 (Excluding the above-mentioned)
Inspection spec
5 – 7
LC-26/32A37M